The advantages that Bitcoin offers are already in other emerging alt coins. They even have better features in actuality. The only real advantage that Bitcoin has is its popularity since it is the first go-to coin for people who want to start with crypto.
There are also some other advantage are present. Bitcoin is globally but widely accepted and in everywhere it has the same value and it is also help in to exchange one country currency into other with profit 
. Bitcoin is used by many online retailer. If you have Bitcoin then you can take the advantage of shopping with out using money. Another biggest advantage is its money transaction facility. In which no third party like bank interfere. And it secure too. And if you earn money through Bitcoin then you don't have to pay tax. 